You originally asked about boost vs flyback. Now
what, bridge vs both?
I'd bet that somewhere somebody has compiled a
list of best-in-class efficiencies for every switcher
topology known.
But how useful that is, in affordable-components
reality, is a whole 'nother question.
I think given the simplicity of the question, finding
a proven design with an acceptable efficiency -
"which is best" being irrelevant if you can't handle
the development - is where you ought to spend
your inquiries.